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' NITED STATES PATENT OFFICE.

:l SAW.

PECIFICATION forming part of Letters Patent No. 297,816, dated April 29,1884.

Appncauon nieu August 24, wsa. (No mfoaem This improvement in saws isapplicable to circular, jig, band, and othersaws; andit con sists,essentially,'in the adaptation of the blade to plane and smooth eitherone orv both of thel walls or sides to the slit or opening made by theordinary operation ofthe saw, substantially as hereinafterdescribed,vreference being had to the drawings, in which- Figure lis aface view. Fig. 2 is a crossfsec' tion on1ine2 2, Fig. l. Fig. 3 isacross-section on line3 3, Fig. l. Y

In the drawings, A represents a circularsaw blade having teeth B, all ofthe ordinary construction, except as tothe features of this invention.O-O are a-series of cutting-edges at each side face of the saw-blade.These cutting-edges are arranged in a circular row, and each is radial,or substantially so, with the axis of the sawblade; and forward and infront of each the blade is made with a throat or opening, D, throughitsihickness, all as shown, and so that as the saw-blade in operationsaws through a board,said cutting edges,in turn and successively, willplane and smooth that edge or wall of the split in the board, as it isso made by the saw which adjoins them or in con tact with which they runas the saw rotates. The throat D for each cutting-edge is made bypunching out thmetal forming thesaw-blade, and the cutting-edge at eachthroat is then made by beveling off and forcing or pressing out one edgeof said throat,and so that,projeet ing from the side or face of theblade, it will act tfplane and smooth the edge of the board with whichsuch face of the saw is in contact when the saw is in operation.

As shown, the saw may be provided with cutting or planing edgesOat andupon both of 45 its sides; but, if desired, either side only may be soprovided; and, again, the invention herein described is plainlyapplicable to sawblades of other forms than circular.

Having thus described my invention, what 5c I claim is- A saw-bladehaving cutting-edges O, made integral with the blade, in combinationwith throats or openings D through the blade, substantially as and forthe purpose specified.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing witnesses.

JOSEPH LEDWARD.

